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Layer: Geologic Units (ID: 3343)

Parent Layer: Rill Creek Kane Springs MP-175DM

Name: Geologic Units

Display Field: UnitName

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The southern half of the Rill Creek quadrangle and the northern half of the Kane Springs quadrangle, Grand and San Juan Counties, Utah, cover the southeastern half of the Moab-Spanish Valley salt graben and the neighboring bedrock plateaus to the southwest and northeast. The graben is the largest of several northwest-trending collapse structures over a deformed salt mass in the Pennsylvanian Paradox Basin of southeastern Utah and southwestern Colorado. The northwestern part of the graben is covered by the Moab 7.5’ quadrangle (Utah Geological Survey Map 181, published in 2002). Mapping of this quadrangle-sized area is part of a broader effort to understand active salt deformation and the associated landscape evolution and geologic hazards in the ancestral Paradox Basin. Strata from Late Triassic to Late Cretaceous age are exposed in the map area, and Quaternary units include alluvial, colluvial, eolian, mass-wasting, and fluvial terrace deposits. Graben subsidence is accommodated by systems of shallowly seated, near-vertical, gravitational faults along the margins of Spanish Valley. The two graben-margin fault zones display contrasting deformation styles and fault geometries. Ongoing Quaternary subsidence in Spanish Valley is documented in the spatial and temporal distribution of terrace deposits along Mill and Pack Creeks, which confirms previous hypotheses of active salt deformation. The hazard of active, aseismic, salt-dissolution collapse and faulting appears to be modest, with greater concern relating to attendant mass-wasting processes along the valley margins. 

Copyright Text: Program Manager: Stefan M. Kirby (UGS) Project Manager: Grant C. Willis (UGS) GIS and Cartography: James P. Mauch (Utah State University Geology Department, thesis project; now Wyoming State Geological Survey), Kent D. Brown, Lori J. Steadman (UGS) Geology review: Susanne Janecke (USU); Grant Willis, Stephanie Carney, Mike Hylland (UGS) GIS and Cartographic review: Keilee A. Higgs (UGS) Funding: U.S. Geological Survey, EDMAP award number G16AC00205 (2016) and Utah State University and Utah Geological Survey

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